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The 11 spd Ultegra RD-R8000 GS (longer cage) works like normal for an 11-36 cassette, and works fine for an 11-40 cassette. No roadlink necesary. If 11-42, then Wolftooth Tanpan + MTB RD-M8000 GS.
@skinny how was the 11-40 with DI2 on italy divide?
"Key to the design is the ability to maintain what they consider factory levels of chainwrap and shifting performance with most cassettes."
https://bikerumor.com/2018/03/16/run-bigger-gears-on-shimano-r9100-8000-derailleurs-w-wolf-tooth-roadlink-dm/
Maybe it's worth trying out? Although I bought mine years ago so it might not even work with the new RD I have.